never heard of a ' cork ',,,
repair but have only been doing this for 35yrs,,, that's 1 big pinhole, btw,,, there needs to be ' flashing ' & drainage,,, flashing could be membrane but drainage is gravity ONLY,,, whatever repair method is chosen, you'll need some guarantee,,, not certain the std h/o warranty's worthwhile.
btw, there're many balconies which do NOT leak.
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